Vacuum cleaner



FIG. 1 is a front elevation view of a vacuum cleaner showing our new design;

FIG. 2 is a side elevation view thereof;

FIG. 3 is a side elevation view of the opposite side of FIG. 2;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a top plan view theerof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a vacuum cleaner, as shown and described. 